203 lines
7.1 KiB
C
203 lines
7.1 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Artem Bityutskiy (Битюцкий Артём)
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*/
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#ifndef __LINUX_UBI_H__
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#define __LINUX_UBI_H__
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#include <asm/ioctl.h>
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#include <linux/types.h>
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#include <mtd/ubi-user.h>
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/*
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* UBI data type hint constants.
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*
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* UBI_LONGTERM: long-term data
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* UBI_SHORTTERM: short-term data
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* UBI_UNKNOWN: data persistence is unknown
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*
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* These constants are used when data is written to UBI volumes in order to
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* help the UBI wear-leveling unit to find more appropriate physical
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* eraseblocks.
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*/
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enum {
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UBI_LONGTERM = 1,
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UBI_SHORTTERM,
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UBI_UNKNOWN
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};
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/*
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* enum ubi_open_mode - UBI volume open mode constants.
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*
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* UBI_READONLY: read-only mode
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* UBI_READWRITE: read-write mode
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* UBI_EXCLUSIVE: exclusive mode
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*/
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enum {
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UBI_READONLY = 1,
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UBI_READWRITE,
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UBI_EXCLUSIVE
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};
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/**
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* struct ubi_volume_info - UBI volume description data structure.
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* @vol_id: volume ID
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* @ubi_num: UBI device number this volume belongs to
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* @size: how many physical eraseblocks are reserved for this volume
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* @used_bytes: how many bytes of data this volume contains
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* @used_ebs: how many physical eraseblocks of this volume actually contain any
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* data
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* @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME)
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* @corrupted: non-zero if the volume is corrupted (static volumes only)
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* @upd_marker: non-zero if the volume has update marker set
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* @alignment: volume alignment
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* @usable_leb_size: how many bytes are available in logical eraseblocks of
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* this volume
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* @name_len: volume name length
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* @name: volume name
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* @cdev: UBI volume character device major and minor numbers
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*
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* The @corrupted flag is only relevant to static volumes and is always zero
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* for dynamic ones. This is because UBI does not care about dynamic volume
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* data protection and only cares about protecting static volume data.
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*
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* The @upd_marker flag is set if the volume update operation was interrupted.
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* Before touching the volume data during the update operation, UBI first sets
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* the update marker flag for this volume. If the volume update operation was
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* further interrupted, the update marker indicates this. If the update marker
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* is set, the contents of the volume is certainly damaged and a new volume
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* update operation has to be started.
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*
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* To put it differently, @corrupted and @upd_marker fields have different
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* semantics:
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* o the @corrupted flag means that this static volume is corrupted for some
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* reasons, but not because an interrupted volume update
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* o the @upd_marker field means that the volume is damaged because of an
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* interrupted update operation.
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*
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* I.e., the @corrupted flag is never set if the @upd_marker flag is set.
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*
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* The @used_bytes and @used_ebs fields are only really needed for static
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* volumes and contain the number of bytes stored in this static volume and how
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* many eraseblock this data occupies. In case of dynamic volumes, the
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* @used_bytes field is equivalent to @size*@usable_leb_size, and the @used_ebs
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* field is equivalent to @size.
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*
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* In general, logical eraseblock size is a property of the UBI device, not
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* of the UBI volume. Indeed, the logical eraseblock size depends on the
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* physical eraseblock size and on how much bytes UBI headers consume. But
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* because of the volume alignment (@alignment), the usable size of logical
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* eraseblocks if a volume may be less. The following equation is true:
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* @usable_leb_size = LEB size - (LEB size mod @alignment),
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* where LEB size is the logical eraseblock size defined by the UBI device.
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*
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* The alignment is multiple to the minimal flash input/output unit size or %1
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* if all the available space is used.
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*
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* To put this differently, alignment may be considered is a way to change
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* volume logical eraseblock sizes.
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*/
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struct ubi_volume_info {
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int ubi_num;
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int vol_id;
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int size;
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long long used_bytes;
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int used_ebs;
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int vol_type;
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int corrupted;
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int upd_marker;
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int alignment;
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int usable_leb_size;
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int name_len;
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const char *name;
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dev_t cdev;
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};
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/**
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* struct ubi_device_info - UBI device description data structure.
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* @ubi_num: ubi device number
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* @leb_size: logical eraseblock size on this UBI device
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* @min_io_size: minimal I/O unit size
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* @ro_mode: if this device is in read-only mode
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* @cdev: UBI character device major and minor numbers
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*
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* Note, @leb_size is the logical eraseblock size offered by the UBI device.
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* Volumes of this UBI device may have smaller logical eraseblock size if their
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* alignment is not equivalent to %1.
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*/
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struct ubi_device_info {
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int ubi_num;
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int leb_size;
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int min_io_size;
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int ro_mode;
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dev_t cdev;
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};
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/* UBI descriptor given to users when they open UBI volumes */
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struct ubi_volume_desc;
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int ubi_get_device_info(int ubi_num, struct ubi_device_info *di);
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void ubi_get_volume_info(struct ubi_volume_desc *desc,
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struct ubi_volume_info *vi);
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struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode);
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struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
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int mode);
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void ubi_close_volume(struct ubi_volume_desc *desc);
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int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset,
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int len, int check);
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int ubi_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
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int offset, int len, int dtype);
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int ubi_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf,
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int len, int dtype);
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int ubi_leb_erase(struct ubi_volume_desc *desc, int lnum);
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int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum);
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int ubi_is_mapped(struct ubi_volume_desc *desc, int lnum);
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/*
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* This function is the same as the 'ubi_leb_read()' function, but it does not
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* provide the checking capability.
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*/
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static inline int ubi_read(struct ubi_volume_desc *desc, int lnum, char *buf,
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int offset, int len)
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{
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return ubi_leb_read(desc, lnum, buf, offset, len, 0);
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}
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/*
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* This function is the same as the 'ubi_leb_write()' functions, but it does
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* not have the data type argument.
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*/
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static inline int ubi_write(struct ubi_volume_desc *desc, int lnum,
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const void *buf, int offset, int len)
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{
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return ubi_leb_write(desc, lnum, buf, offset, len, UBI_UNKNOWN);
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}
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/*
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* This function is the same as the 'ubi_leb_change()' functions, but it does
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* not have the data type argument.
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*/
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static inline int ubi_change(struct ubi_volume_desc *desc, int lnum,
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const void *buf, int len)
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{
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return ubi_leb_change(desc, lnum, buf, len, UBI_UNKNOWN);
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}
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#endif /* !__LINUX_UBI_H__ */
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